<!DOCTYPE html>

<html>

<head>

    <meta charset="UTF-8" />

    <title>Hello React!</title>

    <script src="https://unpkg.com/react@17/umd/react.production.min.js" rel="external nofollow" rel="external nofollow"></script>

    <script src="https://unpkg.com/react-dom@17/umd/react-dom.production.min.js" rel="external nofollow" rel="external nofollow"></script>

    <script src="https://unpkg.com/babel-standalone@6/babel.min.js" rel="external nofollow" rel="external nofollow"></script>

</head>

<body>

    <div id="example"></div>

    <script type="text/babel">

        ReactDOM.render(

        <h1>学编程，就到W3Cschool</h1>, document.getElementById('example') );

    </script>

</body>

</html>